Skuntank @ Black Sludge
EVs: 216 HP/252 ATK/40 Spdef
With this spread, Skuntank will only take 22%-27% damage from a Duosion's Signal Beam that has no SpA investment. In fact, it will only have a 46%~ chance to OHKO Skuntank even with 6 Calm Mind boosts meaning Skuntank can normally always switch in on Duosion comfortably and scare it with Pursuit. Pursuit will deal 50%-60% of this Duosion's health with its particular EV investments if it switches. Taunt blocks Duosion from Recover stalling and setting up with CM.